Well tool swivel device



Feb. 3, 1953 R. c. BAKER 2,627,316;

wELL TOOL SWIVEL DEVICE Filed July 1, 194e s sheets-sheet 1y 257g?. l, C'E gg 2.

I N VEN TOR.

baur/@M Feb. 3, 1953 R. C. BAKER WELL TOOL SWIVEL DEVICE Filed July l,1946 5 Sheetsheet 2 INVENTOR.

Patented Feb. 3, 1953 WELL TOOL SWIVEL DEVICE Reuben C. Baker, Coalinga,Calif., assignor to Baker Oil Tools, Inc., Vernon, Calif., a corporationof California Application July 1, 1946, Serial No. 680,665

(Cl. 16B-12) 12 Claims. l

This invention relates to well tools especially useful in theperformance of cementing, acidizing, washing, testing, anchoring andsimilar functions in oil and gas wells.

Certain well tools are operable by moving their parts with respect toone another through manipulation of an attached tubing string. Therelative movement may result from holding one of the tool partsrelatively stationary through casing or formation engaginginstrumentalities, or by otherwise resisting its movement. Some suchdevices are in engagement with the wall of the casing or formation andtend to resist rotation of the well tool when rotation of the attachedtubing string, with-out corresponding revolution of the devices, mightbe desirable. An example of the desirability of not rotating the casingor formation engaging instrumentalities is in removing the well toolfrom the Well bore by unscrewing the tubing or drill pipe joints veryreadily through rotation, by the rotary table at the top of the hole, ofthe entire tubular string remaining in the well bore. Where suchrotation has been attempted in the past, the casing or formation wallengaging means has also been rotated, with potential damage to it and toother parts of the well tool.

Accordingly, it is an object of the present inventi-on to permit thetubing string to be rotated without corresponding rotation of the welltool elements engaging the casing or formation wall.

Another object of the invention is to provide a Well apparatus in whichthe tubing string to which the well apparatus is attached may be rotatedwithout rotating the apparatus itself.

A further object of the invention is to provide for the rotation of thetubing string without corresponding rotation of a well tool attached tothe tubing string, in which the to-ol and tubing string may bepositively coupled together to allow at least part of the well tool torotate in unison with the tubing string.

Still another object of the invention is to p-ro- Vid-e a well toolembodying a locking device controlled by movement of a tubing string, towhich the well tool is attached, with respect to a casing engaging dragservice constituting part of the well tool, the tubing string beingmovable to operate the locking device in its normal manner and yetrotatable through a large number of revolutions with-out correspondingrotation of the drag device.

Another object of the invention is to provide a well tool for anchoringto a casing, which can be forcibly retracted from engagement with thecasing through rotation of a tubular string to which the tool isattached, without rotating a casing engaging drag device forming part ofthe tool.

This invention has other objects which will become apparent from aconsideration of the embodiments shown in the drawings accompanying andforming part of the present specification. These forms will now bedescribed in detailV to illustrate the general principles of theinvention, but it is to be understood that such detailed description isnot to be taken in a limited sense, since the scope of the invention isbest defined by the claims appended hereto.

Referring to the drawings:

Figure l is a longitudinal section, partly in elevation, of one form ofthe invention positioned with-in a well casing;

Figure 2 is a longitudinal section on anenlarged scale of the swiveldevice shown in Figure l;

Figure 3 is a cross-section taken along the line 3 3 in Figure 2;

Figure 4 is a cross-section taken along the line 4 4 in Figure 2;

Figure 5 is a longitudinal section through another embodiment of theinvention;

Figure 6 is a longitudinal section through still another form of theinvention; and

Figure '7 is a View like Figure 6, with parts in another operativeposition,

The invention is illustrated in the drawings as tpplied to a well tool Amovable through a Well casing B by virtue of its attachment to a tubularstring C of tubing or drill pipe. The tool disclosed is a well pack-er`of the type described in my United States Patent 2,368,400, in which anupper body or mandrel IU is connectable to the lower end of the tubingstring, and is attached to a lower body II by means of a suitable lefthand threaded connection I2. A packing actuator I3 is secured to thelower end of the lower body II and engages a pack-ing sleeve I4surrounding the body, whose upper end contacts a conical slip expanderI5 having upwardly and inwardly taperingsurfaces I6 engageable withcompanion surfaces I'I on a plurality of spaced circularly disposedslips I8 supported by a sleeve I9 through the medium of pins 2li andlinks 2|.

The sleeve I9 is connected by a suitable swivel 22 to a collar or sleeve23 forming part of a lock device, and embodying a slot 24, 25 of J `or Lshape in which a lock pin 26 secured to the 'mandrel I may move. Thesleeve has a drag service attached to it, which, as shown in thedrawings, includes a plurality of circularly spaced outwardly bowed leafsprings 21, whose lower ends are table at the top of the well bore.

suitably secured to the sleeve 23, as by an encircling ring 28 andscrews 29, and whose upper ends are also suitably secured to an uppercollar 30 slidable on the mandrel I0, as by an encircling ring 3| andscrews 32. y

As explained in the above patent, the packer A is movable through thewell casing B with its parts locked in retracted position, as governedby the location of the lock pin 26 in the horizontal portion 24 of thelock slot. When in such position, the slips I8 and expander I5 cannotmove longitudinally with respect to one another to anchor the former tothe wall of the well casing. But when anchoring is desired, the tubingstring C is rotated to the left or counterclockwise (looking down) toposition the lock pin 2t at the lower end of the longitudinal slotportion 25.

Relative rotation between the mandrel I0 (and its v'lock pin) and thelock sleeve 23 takes place, fsince the frictional force of the dragsprings 2l against the wall of the casing resists or preventscorresponding rotary movement of the sleeve 23.

The moving of the tubing string C and attached mandrel Il) and lowerbody II in an upward direction then moves the packing sleeve I 4 andconical expander l5 upwardly with respect to the slips I8, which areheld stationary 'by virtue of their coupling to the friction drag device21, the expander l5 shifting the slips I3 outwardly into anchoringengagement with the casing wall, which prevents further upward movementof the expander, after which a continuation of the upward movement ofthe tubing string', mandrel and body foreshortens the packing sleeve I4between the expander I5 and pack- 1 ing'actuator I3 and expands itradially outward 'f into leakproof sealing engagement with the wall ofthe casing.

The desired operation in the well bore may now take place, and whencompleted, the tool may be retrieved from the well casing by loweringthe tubing string C and connected mandrel It and lower body I I, whichshifts the lock pin 25 downwardly of the sleeve 23 (held stationary bythe drag springs), and then turning the tubing string to the right torelocate the' lock pin in the horizontal slot portion 2li of the lockingdevice, in

which position the packing Ill and slips I 8 are again held in retractedposition. The tool may now be elevated in the well casing to the top ofthe well bore.

In elevating the tool, rotation of the tubing string in the well casingmay be desirable to unscrew rapidly and easily the sections or stands oftubing or drill pipe positioned above the rotary Such rotationordinarily produces revolution of the friction drag device 2l, since therotary motion of the l tubing is transmitted to the drag device throughthe mandrel pin 26 and lock slot sleeve 23. If such rotation of theentire tubing string to produce rapid unthreading of the pipe sectionsremoved from the well bore is attempted, the fricj tion drag device 2land other parts of the well tool might be damaged in being draggedaround driven rotary table.

The present invention provides a device which permits the tubular stringin the well casing to be rotated without rotating the drag device, andwithout rotating the well packer itself, unless such rotation ispurposely desired. The invention also includes the ability to unscrewthe left hand threaded connection l2 whenever' the slips I3 and packingI are to be forcibly retracted.

Speciiically, as shown in the embodiment of Figures 1 to 4, a swivel 33is incorporated be tween the tubular string C and the mandrel It, whichis capable of transmitting suiicient rotary force between the tubingstring and mandrel to operate the lock device 23, 2t, but which isincapable of transmitting sufficient rotary force to produce rotation ofthe drag device 2l around the casing wall.

The friction swivel, which may be considered as' part of the tubingstring or of the well tool, includes a collar 3G threaded to an uppertubing section 35 and to a lower inner tubular coupling member 35received within an outer coupling member 3l threaded on a sub 38, which,in turn, is threaded on the tool mandrel I9. The inner tubular couplingmember 35 has a lower enlarged head 39 carrying side seals lil engagingthe wall of the outer coupling member or cylinder 31 to prevent leakageof fluid therebetween. Upward pulls or strains between the inner andouter coupling members are transmitted from the head 39 through asuitable thrust bearing washer 4I onto a shoulder QZ in the outercoupling member 3l'.

The outer coupling member or cylinder is provided with an inner,upwardly diverging, tapered surface 43, in which is received a pluralityof wedge-shaped friction segments il having external tapered surfacesengageable with the outer member tapered surfaces 43, and with the Yinner cylindrical surfaces 4e engageable with the wardly betweenadjacent coupling segments.

The segments are urged downwardly into frictional engagement with theinner coupling member 35 by a helical spring 9, whose lower end bearsagainst a thrust bearing washer 5l) resting v on the upper ends of thesegments, and whose upper end engages an adjusting nut 5I threaded onthe inner coupling member, which can be rotated to provide the requiredcompressive force in the spring urging the segments 44 down along thecylinder tapered surface 43 and into frictional engagement with theexterior l of the inner coupling member 35. A suitable lock nut 52 maybe threaded on the inner coupling member against the adjusting nut 5I tohold the latter in the position to which is has been moved incompressing the spring.

Rotation of the tubular string C correspondingly rotates the innercoupling member 36, and,

through the frictional engagement between the latter and the frictionsegments lle, rotates the outer coupling member 3l and the mandrel Il)secured to it. The spring i9 is adjusted to provide sunicient frictionaldrive between the inner and outer coupling members 36, 3l as to permitIrotary movement of the lock pin 26 in and out of the horizontal lockingportion 2li of the J slot, but such friction force is less than thefrictio of the drag springs 2l against the casing wa With the frictionswivel device 33 included between the tool mandrel I0 and tubing section35,

thawell fpacker is operated in 5the `:same manner as if :the Lfriction`swive1 .device were not lpres ont; that is, `:the itu'bingsstring C-lisro'tatedlto `the 'left to iposition `the `flock pinf26in the llongitudinnal portion `25 lof the sleeve slot fand theutubing `.string elevated.to anchor the slips LIB Vand veX- pand lthepaclring `I-l against `thecasing B. vThe required'.rotarymovement is transmitted through thefriction clutch .35,-44,.31,1and the necessary upward movement istransmitted through the lhead .39 on the inner coupling member .to the"shoulder '42 on the `outer Acoupling member 3.1. Conversely, thelowering movement-of the tubing `string YC will be transmitted to the.mandrel Il), to realign thelock .pinr26 andthe. horizontal ,portion 24of the slot, throu'ghlthe .adjustablefspring .'49 andgfriction segments4t, or through fabutting .of the inner .coupling member :head L39withthe upper .end of the sub1-3:3. Thereafter, Vrotation `of thextubingstring C to the right effects a 4fric- .tion drive of `the tubularmandrel l] to` the right to position the lockipin inthe horizontal lockportion 24 of the slot and locks the .slips VI8 and packing |14 `inretractedposition free from engagement with theicasingB.

With the parts in this locked position, the tool may be rapidly removedfrom the well casing. After the tubing string is elevated in the wellbore to place the permissible length of tubing above the .rotary table,the tubing `may be coupled to the rotary table and the tubing standthereabove held stationary. The rotary table may now be rotated by theprime mover to unscrew thecoupling or threaded joint immediately abovethe table, all of the tubing in the casing being correspondingly rotatedt-o the right without rotating the well tool A, the lattei being heldstationary by the casing engaging friction drag `springs 21 andtheslipping of the inner coupling member 36 with respect to the frictionclutch segments M. As aforementioned, the friction between the innercoupling member 35 and friction segments 44 is less than the frictionalforce between the drag springs 21 vand casing wall, which allows theinner couplingmember to slip with respect to the `coupling segments `andouter coupling member 51, and the tool parts connected to the latter. Asmore and `more stands of pipe are raised above the rotary table of thewell bore in elevating the well tool from the casing, they may bedisconnected inthe same manner through rotation of the .rotary table,which will not rotate the well tool, and consequently, cannot damage thetool or disrupt or twist `the drag springs 21.

Inthe tool shown in the drawings, andas speciflcal'ly described in thepatent above referred to, it may 4sometimes be necessary to unscrew themandrel It from the lower body II 4in order to forcibly retract the`slips I8 from anchoring engagement in the casing B. Unscrewing of theleft hand threads I2 on the mandrel from the lower body elevates aflange 53 on the mandrel I0 into engagement withthe slip ring I9 andproduces forcible retraction of the slips I8 from the casing B.

The present invention provides means for effecting unscrewing of themandrel I0 in an upward direction from the body II. Specifically, aclutch is provided at the lower end of the inner coupling member 3Badapted for downward movement into positive driving engagement with thesub 38 attached to the mandrel l0. Such positive driving engagement isaccomplished by the mating of teeth or dogs `514' on the sub 1ncompanion `recesses 55 in the end of the mner .cou-

casing.

pling `:member .head 3 6. lFollowing l.such fdo'wn- "-wardpmovement,rotation ofthe tubing string -C .ettects positive rotation of the.mandrel I0, to screw the latter upwardly of .the body AII and Aefrect`forcible retraction of .the slips I8 .from the Such rotation occurswithout correspending rotation `of the slips I8 :by virtue rof the:swivel Iconnection 22 between the locksleeve 23 .member .31, s111033,mandrel I5, .friction .drag device 21 and other parts of the well tool.

.In the form `of .invention illustrated in Figure A5, the well tool maybe rotated without `rotating `thefrictiondrag device, andrelativerotation .be-

tween the mandrel Ill `andlower body I I Vmay be effected without thenecessity of employing fa releafsable coupling, such as the positive dogclutch 54, ,'55 .in the above described form of the invention. Thetubing string C is connected directly to the mandrel Iii, and a frictionswivel connection is provided between the lock sleeve 23 and thefriction drag device 21..

As shown in the drawings, the swivel connection includes a clutch collaror ring 55, to which the drag springs 21 are attached, rotatable on the.loclr vsleeve 23, but having a rotatable friction drive therewith byvirtue of the engagement of a clutch ldisc 51 with the lower end ofthecollai' 56 and a sleeve shoulder 58, and engagement of a second clutchdisc 59 with .the upper surface of the collar 56 and a ring having aslidable spline connection with the sleeve through one or more pins 5Isecured to the sleeve and loosely iitting in one or more holes 62 in thering. The clutch discs 51, 59 are engaged frictionally with the clutchcollar 55, sleeve shoulder 5B and ring VIii! by a helical spring 53encircling the sleeve 23 with its lower end engaging the ring 50 and itsupper end an adjusting nut (i4 threaded on the upper end of the sleeveto determine the comperssive force of the spring.

The force exerted by this spring 63 is so chosen that the frictionclutch prevents rotary movement between the sleeve 23 and friction dragdevice 21 in .allowing rotation of the lock pin 26 into and from thehorizontal locking portion 24 of the J slot. However, the frictionclutch will slip and allow the lock sleeve 23 to rotate with respect tothe drag device 21 before the drag device can be rotated Varound thewall of the casing B.

Thus, in the Figure 5 embodiment, the tool may be operated in moving theslips I8 and packing Il! into and from engagement with the casing, withtheir relative movement determined by the frictional engagement of thedrag device 21 against the casing and the position of the lock pin 26 inthe lock slot 24, 25. Moreover, upward movement of the mandrel Il! withrespect to the body II through. rotation of the former to eectunthreading of the mandrel at the left hand threads I2 can take place inthe usual manner. Such rotary movement of the mandrel IIJ, however, willnot be transmitted to the friction drag device 21, for the reason thatthe friction clutch at the lower end of the drag device will slip andthe upper drag collar 30 is always free Von the mandrel :10.

' faczzsie Similarly, after the parts of the tool have been `.retractedand the lock pin 26 positioned in the .ures 1 to 5, but may be used inother well tool devices.

For example, the tool illustrated in Figures 6 and 7 employs a dragdevice 65 connected to an operating rod 66 extending into a valvehousing 61 for controlling the ability of a ball valve member 68 to movedownwardly into engagement with its seat 69. The valve housing 51 isconnected to a string of tubing C running to the top of the well bore.

The valve operating rod 66 carries a pin 'lil movable in an inverted Jor L slot 1l, 12. When the tubing string C has been lowered with respectto the operating rod 6B, which tends to remain stationary because of theengagement of its drag springs 65 with the casing wall, the upper end ofthe rod 66 engages the ball valve S3 to elevate it from its seat 69. Theturning of the tubular string C to the right then positions the lock pinin the horizontal portion 1| of the slot and maintains the rod upwardly,holding the ball valve from the seat and permitting fluid to be pumpeddownwardly through the tubing string C, around the elevated ball valvemember 58, through the seat 69, and out of the valve housing ports 13below the seat to the exterior of the tubing string. With the pin 1i! inthe horizontal slot portion 1|, or in ball elevating position, thetubing string C may be lowered or elevated in the casing withoutengagement of the ball t8 with its seat 69, which would close the tubingstring to downward ow of fluid therethrough and out through the ports13.

Conversely, rotation of the tubing string to the left shifts the pin 10into the upper end of the longitudinal slot portion 12 and permitselevation of the tubing string to remove the operating rod 56 fromengagement with the valve ball member 68, allowing the latter toreengage its seat 52.

In the event it is desired to effect disconnection of the tubingsections elevated above the rotary table from the tubing remaining inthe well casing by the rotary table, without rotating the drag springs65 around and along the wall of the casing B, a frictional swivel devicesuch as disclosed in Figures 1 to 4 may be incorporated in the tubingstring C above the valve housing 61; or a friction swivel device may beincluded between a lower drag spring collar 14 and the operating rod 66.

The arrangement in Figures 6 and '7 includes the outer drag collar 14mounted around an inner drag sleeve 15 threaded on the valve operatingrod 65, and locked thereon by a suitable nut l. A friction clutch disc11 is located between the drag collar 14 and a lower sleeve shoulder 1B,with a helical spring 19 surrounding the sleeve and compressed betweenthe collar or ring 1d and a thrust bearing washer 80 abutting anadjusting nut 8| threaded on the upper end of the sleeve 15. The spring19 urges the collar 14, friction disc 11 and sleeve shoulder 18 into'frictional clutch driving relation with respect to one another.

The operation of the apparatus shown in Figures 6 and 7 is substantiallythe same as in the slip well packer shown in Figure 5. The frictionalforce exerted between the clutch disc 11 and its engaging members 14, 18is less than the frictional force of the drag springs 65 against theWall of the well casing B. This frictional clutch force, however, issufficient to hold the valve operating rod 66 relatively stationary topermit movement of the lock pin 10 within the lock slot 1l, 12 incontrolling operation of the ball valve 68 with respect to its seat 69.If the tubing string C is rotated, the entire apparatus, with theexception of the drag springs 65, its connected upper and lower collars14, 14a and coil spring 19, is rotated, preventing the need for forciblesliding of the drag springs 65 around the casing wall. In this manner,the well tool may be quickly removed from the well casing throughrotation of the tubing string by the rotary table at the top of thehole.

While I have described several embodiments of my invention, what I claimand desire to secure by Letters Patent is:

l. Well apparatus adapted to be lowered in a well conduit or the like ona tubular string, including normally retracted slips, expander means formoving said slips into engagement with said well conduit, releasablelock means for preventing substantial relative longitudinal movementbetween said slips and expander means, tubular means operativelyconnected to said expander means and connectable to said tubular string,a drag device frictionally engageable with said well conduit androtatably connected to said slips, and friction clutch means forcoupling said drag device to said lock means, said friction clutch meanshaving a load transmitting capacity suiicient to eifect operation ofsaid lock means, but insufcient to overcome the normal resistance tomovement offered by said drag device when engaging said well conduit.

2. Well apparatus adapted to be lowered in a well conduit or the like ona tubular string, including a rst part, a second part cooperable withsaid rst part, a releasable lock for locking said parts together toprevent substantial relative movement between said parts, tubular meansoperatively connected to said first part and connectible to said tubularstring, drag means operatively connected to said second part andfrictionally engageable with said well conduit to resist movement ofsaid second part therewithin, friction clutch means for coupling saidlock to one of said means, said friction clutch means having a loadtransmitting capacity sufficient to effect operation of said lock, butinsuiiicient to overcome the normal frictional resistance to movementoffered by said drag means when engaging said well conduit, and meansfor adjusting said friction clutch means to predetermine the maximumtorque transmittable therethrough without slippage.

3. Well apparatus adapted to be lowered in a well conduit or the like ona tubular string, including a first part, a second part cooperable withsaid rst part, a releasable lock for locking said parts together toprevent substantial relative movement between said parts, tubular meansoperatively connected to said rst part and connectible to said tubularstring, drag means operatively connected to said second part andfrictionally engageable with said well conduit to resist movement ofsaid second part therewithin,l and. friction` clutch means for couplingsaid lockto one of said means, said frictionV clutch` means having aload transmitting capacity suicient to effecty operation of said lock,but insuicient to overcome the', normal frictional resistance tomovement offered by said drag` meanswhen: engaging; said well conduit.

4.\Well, apparatus adapted to be lowered in a well conduit or the like`on av tubular string, including a first part, a` second part` cooperablewith said firstipart, releasable lock means for licking'said partstogether to prevent substan tial relative movementl between said parts;tubular means rotatably connected to said nrstipart and connectibletosaid tubular string.` a device operatively connected to said second partand frictionally engagea-ble with said well conduit to resist movementof-saidisecond part therewithin, friction clutch means connectingsaidtubular means to said iirst part for transmitting the torque of saidtubular means to said first part, said frictionclutch means havingalload transmitting capacity sufcient to effect operation of said lockmeans, but insufcient to overcome the normalfrictionalresistance tomovement offered by said device when engaging said well conduit.

5. Well apparatus adapted to be lowered in a well conduit or the like ona tubular string, including a first part, a secondpart cooperable withsaid first part, releasable lock means for locking saidlparts togetherto`prevent substantial relative movement between said parts, tubular meansrotatably. connected to said firstipart and connectible to said tubular:string, a device frictionally engageable with. said well conduit androtatably connected to` said second partkto resist movement ofsaidsecond part therewithin, friction clutch means between said device andsecond, partl for transmitting the torque imposed on said second part tosaid device, said friction clutch means having a load transmittingcapacity suflicient to cause said device to resist rotation of said lockmeans in order to effect operation of said lock means, but insuicient toovercome the normal frictional resistance to movement offered by saiddevice when engaging said well conduit.

6. Well apparatus adapted to be lowered in a Well conduit or the like ona tubular string, including a first part, a second part cooperable withsaid first part, releasable lock means for locking said parts togetherto prevent substantial relative movement between said parts, tubularmeans rotatably connected to said first part and connectible to saidtubular string, a device operably connected to said second part andfrictionally engageable with said well conduit to resist movement ofsaid second part therewithin, friction clutch means connecting saidtubular means to said rst part for transmitting the torque of saidtubular means to said rst part, said friction clutch means having a loadtransmitting capacity suiicient to effect operation of said lock means,but insuflicient to overcome the normal frictional resistance tomovement offered by said device when frictionally engaging said wellconduit, a positive drive clutch element on said tubular means, and apositive drive clutch element on said first part engaged by said clutchelement on said tubular means upon downward movement of said tubularmeans relative to said first part.

7. Well apparatus adapted to be lowered in a wellv conduit or the likeonl atubular string, inl--` cluding aifirst part, a `second par-tcooperable with said first part, releasablef lock means for locking saidparts together toprevent substantial relative movement between said`parts tubular means rotatably connected to` said first part andconnectible` tosaidtubular` string, a device operably connected toAsaid-second part and frictionally engageablewithsaidwell conduit'toresist rnovementof'-` said second `part therewithin, friction clutchVmeansI connectingY said tubular means to said first part fortransmitting the torque oi' said tubular means to said rst part, saidfriction clutch means-hav'- ing a loadvtransmitting capacity suflicientto effect operation ofy said lockmeans,- but insuincient to` overcomethe normal frictional i resistance to movement offered by said.A devicewhen engaging said well conduit,- a` positive drive clutch element cnsaidl tubular meansfa positive drive ciutchteiement onsaidfirst-` partengaged by said clutch element onsaiditubuiar means upon downwardmovement of `said tubular means relative to saidr first part, andspringmeans bearing upon said friction clutchimeans and tubular means andtending to elevate said tubular meanswithrespect `to said nrstfpart' todisengage said clutch eiement on said` tubular means fromfisaid clutcheiement-= on said first part.

c. i Well apparatus Aadapted tot be i lowered in ai well conduit or thelike on a tubular string,` including normally retractedslips, expandermeans for moving said slips into eng-agement with said weil conduit,`avreieasaiolelock for-,preventing substantial relative `longitudinal.movement betweensaid slips and expander means, tubular meansoperativelyconnected tofsaid-iexpander means i and` connectioie toA said,A tubularstring, a drag means `frictionallyengageable -with said well; conduitand operatively connected-to said slips, and slippable friction clutchmeans for coupling said lock to one oi' said means, said friction clutchmeans having a load transmitting capacity suijicient to eli'ectoperation of said lock, but insufficient to overcome the normalfrictional resistance to movement offered by said drag means whenengaging said Well conduit.

9. Well apparatus adapted to be lowered in a well conduit or the like ona tubular string, including knormally retracted slips, expander meansfor moving said slips into engagement with said well conduit, tubularmeans connectible to said tubular string, a drag device frictionallyengageable with said well conduit and operatively connected to saidslips, releasable lock means for locking said expander means to saiddrag device to prevent substantial relative longitudinal movementbetween said slips and expander means, and slippable friction clutchmeans connecting said tubular means to said expander means fortransmitting the torque of said tubular means to said expander means,said friction clutch means having a load transmitting capacitysufficient to effect operation of said lock means, but insufficient toovercome the normal frictional resistance to movement offered by saiddrag device when frictionally engaging said well conduit.

10. Well apparatus adapted to be lowered in a well -conduit or the likeon a tubular string, including normally retracted slips, expander meansfor moving said slips into engagement with said well conduit, tubularmeans connectible to said tubular string and rotatably connected to saidexpander means, a drag device frictionally engageable with said wellconduit and operatively connected to said slips, releasable lock meansfor locking said expander means to said drag device to preventsubstantial relative longitudinal movement between said slips andexpander means, slippable friction clutch means connecting said tubularmeans to said expander means for transmitting the torque of said tubularmeans to said expander means, said friction clutch means having a loadtransmitting capacity suiicient to effect operation of said lock means,but insulicient to overcome the normal frictional resistance to movementoffered by said drag device when frictionally engaging said wellconduit, a positive drive clutch element on said tubular means, and apositive drive clutch element on said expander means engaged by saidclutch element on said tubular means upon downward movement of saidtubular means relative to said expander means.

11. Well apparatus adapted to be lowered in a well conduit or the likeon a tubular string, including a rst part, a second part cooperable withsaid first part, releasable lock means for locking said parts togetherto prevent substantial relative movement between said parts, tubularmeans rotatably connected to said first part and connectible to saidtubular string, a device operably connected to said second vpart andfrictionally engageable with said well conduit to resist movement ofsaid second part therewithin, a positive drive clutch element on saidtubular means, a positive drive clutchl elementv on-said rst partengaged by said clutch element on said tubular means upon downwardmovement of said tubular means relative to said first part, andcoengaging means on said tubular means and rst part limiting upwardmovement of said tubular means with respect to said first part to aposition in which said clutch elements are disengaged and said tubularmeans is free to rotate relative to said rst part. 12. Well apparatusadapted toV be lowered in a well conduit or the like on a tubularstring, including normally retracted slips, expander means for movingsaid slips into engagement with said well conduit, tubular meansconnectible to said tubular string, and rotatably connected to saidexpander means, a drag device frictionally engageable with said Wellconduit and operatively connected to said slips, releasable lock meansfor locking said expander means to said drag device to preventsubstantial relative longitudinal movement between said slips andexpander means, a positive drive clutch element on said tubular means,`a positive drive clutch element on said expander means engaged by saidclutch element on said tubular means upon downward movement of saidtubular means relative to said expander means, and coengageable means onsaid tubular means and expander means limiting upward movement of saidtubular means with respect to said expander means to a position in whichsaid clutch elements are disengaged and said tubular means is free torotate relative to said expander means.

REUBEN C. BAKER.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,238,654 Ewarts Aug. 28, 19171,373,810 Hansen Apr. 5, 1921 1,759,337 Zublin May 20, 1930 1,794,196Montgomery Feb. 24, 1931 2,329,939 Phipps Sept. 21, 1943 2,344,121Bassinger Mar. 14, 1944 2,368,400 Baker Jan. 30, 1945

